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` elicited tant @Hicttdtiitra JONATHAN OONE AND WILLIAM K. KELLY, OFBRISTOL, PENNSYLVANIA.

Lehm Paten; No. 99,642, dated February s, 1870.

/llhe Schedule referred to in these Letters Patent and making part ofthe same.

To all whom. it may concern y Be it known that we, .JONATHAN OoNE andWIL- LIAM K. KELLY, of Bristol, in the county of Bucks, and 'State ofPennsylvania, have invented certain Improvements .in Furnace Grate-Bars;and we do hereby declare that 'the following is a full, clear, and exactdescription thereof, reference being had to the annexed drawings, makingpart of this specification, in which- Figure lis an end elevation of aseries of grate-bars 'and of the cradle in which they rest, togetherwith a sectional velevation of the furnace in which they are placed.

Figure 2 is 'a longitudinal vertical section of a bar,showingrtheapertures through the same, the eccentric bearing upon itsinner end, and the projection upon its outer end, for the' reception ofa crank or lever for rocking the bar.

Figure 3 is a perspective view of a complcterbar, showing the aperturesin its upper surface," the truss upon its lower surface, and a differentform of projection for rocking the same.

Figure 4 is a sectional elevation on line a a of fig. 3, showing theform of the bar, its truss, and of the apertures through the same.

Figure 5 is a plan or top View of a series of bars, as they appear whenplaced in a furnace, the dotted lines :showing the cradles upon whichthey rest.

Corresponding letters denote corresponding .parts in the severalfigures.

This invention relates to grate-bars for furnaces, upon which coal orother fuel is to be burned.

To furnace-grates, as heretofore constructed, many yobjections exist,among which may be enumerated the great difficulty of removing theolinker therefrom, owing to the fact that when rocked or turned for thatpurpose, the openings or apertures are constructed, so that as theclinker enters, it is prevented from falling down through, and whenrocked in the opposite direction, the bars are lifted out of theirplaces, and coal is wasted as a consequence.

Our object in the present invention is to provide a remedy for theabove-recited objection, and others not enumerated; and to this end,

-It consists in providing a grate which has upon its under side twobearing-surfaces, which are eccentric to its axis, which, in thisinstance, is supposed to be a light line drawn longitudinally throughthe bar, and connecting the centres of the largest circles that could beinscribed in vertical sections ofthe bar, at the points where it restsupon the cradle, such circles to touch those points; and, further,finproviding a flange upon the inner end of i'nrnace-grates, to preventtheir being moved `longitudinally while being rocked; and, further, inproviding a furnace-grate, having an eccentric bearing-surface, asdescribed, in combination with acradle, having dat surfaces for theeccentric portions of the grate to rest upon; and, further, in providingsuitable projections upon the bars, to which to apply a lever or wrench,for rocking said bars, all as will be more fully described hereinafter.Y

To enable those skilled in the art to make and use our invention, wewill proceed to describe its construction and-operation.

` A, in the drawings, refers to a grate-bar for furnaces, upon whichfuel is to be burned. The form of this grate-bar will be seenbyreferring to figs, 1, 2, and 3, of the drawings, it being designed to bemade of castmetal, with an -elliptical upper surface, and having a trussformation, A', upon its lower surface.

To the upper overhanging portions upon each side of the trussed portionthere are to be formed a series of apertures, E E, of, say,`one inch inlength,'more or less, the upper surface of which is smal-ler than theparts below it, so that any clinker or piece of -coal which will enterat the top will readily pass out at the bottom.. 'Ihese openings serveboth as a passage for the discharge of ashes and for the passage of airin jets to theburuing fuel.

The truss formation upon the under side of the grate does not extendthroughout its entire'leugth, a` suiiicient space being left upon eachend, upon which to form the eccentric journal or bearing-surface D, as

shown in figs. 1 and 2.

.The object of making the above referred to journal eccentric to theaxis of thel grate, is to increase the width of the spaces between thebar, which is being rocked, and those which are next toit, and toprevent the rocking grate from being lifted out of the cradle, whilebeing rocked.

Another advantage arising from this form of journal v is, that anyclinker or clinkers which may pass into the spaces between the'grates,when they are turned or rocked out of their normal position, will becrushed when they are turned in the opposite direction, and thus soreduced in size as to fall readily into the ashpit, without danger oftheir clogging the lower portions ofthe grates.

Upon the outer'ends of the bars which constitute the grate, there is tobe formed aprojection, O, which may be upon the extreme end of thegrate, asshown in figs. 2 and 5, when the grate is placed on a levelwith the lower edges of the furnace-doors, or upon thelower side of thegrate, as shown in iig. 3, when it becomes necessary to place them abovesuch level. These bars rest/in recesses formed incradles B, which mayconsist of castings, which in turn may rest upon the brickwork of thefurnace, or upon projections upon the plates, when iron is used for suchfurnaces. The form of vthese cradles is clearly shown in tig. l of thedraw ings, upon reference to which it will be seen that that' portionupon which the bar rests is flat or horizontal, while a portion of theother surface is vertical, and a portion bevelled, which constructionhasbeen found to be necessary, in order to keep the bar from being liftedout of such recess. There are to be two of these crz'idles, one at eachend of the bars.

Upon the inner ends of the oars A, or upon the end of the journalattached thereto, there is to he formed a downwardly-projeeting flange,F, which will pass down over the edge of the cradle, andeiectnallyprevent the longitudinal movement of the bars while being'rocked. 4

By reference to figs. 3 and 5,-it will be seen that between th'e spacesin the upper elliptical surface of each har there is a continuous smoothsurface, Which form of construction admits of the slice or scraper beingrun under the fuel, for the purpose of removing the ashes, or for anyyother purpose, Without being obstructed by any roughened surface, sothat the opera-` `What'we claim,and desire to secure by Letters Pat-vent, is-

1. Arocking grate for steam-generator and other furnaces, having itsjournals, or the points where it rests upon its supports, 'eccentric toits axis, substantially as and furthe purpose set forth.

2. A furnace-grate, havin/g an elliptical upper surface and abearing-surface eccentric to its axis, substantially as and for thepurpose set forth.-

3. The flange F, upon the inner end of thebar A,

ubstantially as and for the purpose set forth.

4. lhe combination of the cradle B, and the eccentrie journal upontheend of the har A, substantially as apd for the purpose set forth.

5. A grate-bar, having an elliptical upper surface,

in which there Yare two series of apertures parallel to eachother, andan eccentric bearing-surface, and a projection at or near its end, forrocking said bar, all substantially as and for the purpose specified.

In testimony whereof, We have signed our names to 'this specification,in the presence of two subscribing witnesses.

J. GONE. s Y WM. K. KELLX.

Witnesses:

B. EDW. J. Eins,

A. RUPPERT.

